The performance of diesel filters is classified according to ISO standards. When selecting a filter, original parts or a second brand can be used. However, the selected filter needs to be inspected for compliance with the filter performance indicators it should possess.

The diesel filter should be tested according to the ISO4020 standard (Road Vehicles - Test Methods for Fuel Filters for Automotive Diesel Engines) as follows:
1. Conduct a cleanliness test on the new filter to determine whether the inner side of the filter element has been cleaned of any remaining dust and impurities during production, storage, and transportation.
2. Bubble method test: used to confirm whether there are pores in the filter element that are greater than the filtration accuracy.
3. Filtration efficiency and lifespan test Filtration efficiency: Refers to the determination of the percentage of specific particles that are filtered out. The lifespan of the filter is expressed as the time when the blockage test pressure difference is greater than 0.07 MPa.
4. Water separation validity test to determine the percentage of water in the oil-water mixture separated by the filter.
5. Filter element damage test: Determine the anti rupture pressure of the filter element.
6. Filter assembly damage test: Determine the ability of the filter assembly to withstand internal pressure.
7. Pulsating pressure fatigue test: Determine the mechanical strength of the filter assembly under pulsating pressure (simulating engine start or stop).
8. Vibration fatigue test: Determine the mechanical strength of the filter's vibration resistance under normal usage conditions.